I put a different ecm in and there is no difference. I have proper voltages and resistance where i should. I am completely lost on this, If I have spark and I put fuel in the cylinder I should have combustion. I don`t seem to have an injector pulse. Does anyone know what needs to happen to get an injector pulse from the ecm. The engine turns over fine, just no combustion. I did check to see if the 2 cams were timed together and they are.